给你的耳朵一些假期吧! 

工作状态指示灯

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Easy visual check of the noise enclosure status.
If the light is green, everything is fine.

OTHER FEATURES
windows for oil level check
油位观测窗
VACUUM TUBING AND CABLES GROMMET
可锁定全球适配航空插头
GRANT YOUR EARS SOME HOLIDAYS !